Switch between the left and right of the screen implemented by viewPager in android (Getting Started)

Switch between the left and right of the screen implemented by viewPager in android (Getting Started)
Most apps can switch back and forth several screens. First, two new activities are created with random content and layout. Next, in MainActivity. xml: Copy code 1 <RelativeLayout xmlns: android = "http://schemas.android.com/apk/res/android" 2 xmlns: tools = "http://schemas.android.com/tools" 3 android: layout_width = "match_parent" 4 android: layout_height = "match_parent" 5 tools: context = ". mainActivity "> 6 7 <android. support. v4.view. viewPager 8 android: id = "@ + id/viewpager" 9 android: layout_width = "wrap_content" 10 android: layout_height = "wrap_content"> 11 </android. support. v4.view. viewPager> 12 13 </RelativeLayou copy Code do not forget the android-support-v4 package, the current version of 4.0 and later comes with the method in java: copy the Code 1 protected void onCreate (Bundle savedInstanceState) {2 super. onCreate (savedInstanceState); 3 setContentView (R. layout. activity_main); 4 viewPager = (ViewPager) findViewById (R. id. viewpager); 5 View view1 = LayoutInflater. from (MainActivity. this ). inflate (R. layout. a, 6 null); 7 View view2 = LayoutInflater. from (MainActivity. this ). inflate (R. layout. b, 8 null); 9 list = new ArrayList <View> (); 10 list. add (view1); 11 list. add (view2); 12 viewPager. setAdapter (new MyAdapter (); 13} copy code 1 class MyAdapter extends PagerAdapter {2 3 @ Override 4 public int getCount () {5 return list. size (); 6} 7 8 @ Override 9 public boolean isViewFromObject (View arg0, Object arg1) {10 return arg0 = arg1; 11} 12 13 @ Override14 public CharSequence getPageTitle (int position) {15 return titlelist. get (position); 16 17} 18 19 @ Override20 public Object instantiateItem (View container, int position) {21 (ViewPager) container ). addView (list. get (position); 22 return list. get (position); 23} 24 25 @ Override26 public void destroyItem (View container, int position, Object object) {27 super. destroyItem (container, position, object); 28 (ViewPager) container ). removeView (list. get (position); 29} 30}